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Micromachines
Special Issues
Polymer Processing for Microsystems
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Polymer Processing for Microsystems

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (1 October 2020) | Viewed by 10448

Special Issue Editor

Prof. Dr. Sun Kyoung Kim

E-Mail Website
Guest Editor
Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
Interests: manufacturing; data processing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymers in microsystems function as basic substrates, optical devices, flow channels, gas barriers, fabrication aids, surface modifiers, mechanical protection, and so on. For a microsystem to be commercially successful, it should be mass-produced and such functions should be reliably implemented. Polymer processing allows efficient implementation of their functions and safe packaging for longer service. This Special Issue welcomes contributions on advances of the polymer processing technology for any microsystems, including electronic packages, biochips, microfluidic chips, sensors, and microsystems on large systems. Polymer processing here includes molding, printing, encapsulation, extrusion, bonding, welding, coating, and more, using any polymeric materials based on thermoplastics, thermosets, and elastomers. This Special Issue also seeks articles about new methods, applications, and reviews.

Prof. Sun Kyoung Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • polymer processing
  • microsystems
  • mass production
  • microfluidic chips
  • electronic packaging
  • imprinting
  • printing
  • roll-to-roll
  • molding
  • structural electronics
  • coating
  • bonding
  • welding

Published Papers (4 papers)

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Research

17 pages, 3603 KiB  
Article
Rapid Numerical Estimation of Pressure Drop in Hot Runner System
by Jae Sung Jung and Sun Kyoung Kim
Micromachines 2021, 12(2), 207; https://0-doi-org.brum.beds.ac.uk/10.3390/mi12020207 - 18 Feb 2021
Cited by 2 | Viewed by 3013
Abstract
To determine dimensions in the hot runner systems, given a material, it is necessary to predict the pressure drop according to them. Although modern injection molding simulators are able to evaluate such pressure drops, they are expensive and demanding to be employed as [...] Read more.
To determine dimensions in the hot runner systems, given a material, it is necessary to predict the pressure drop according to them. Although modern injection molding simulators are able to evaluate such pressure drops, they are expensive and demanding to be employed as a design utility. This work develops a computer tool that can calculate a pressure drop from the sprue to the gate assuming a steady flow of a generalized Newtonian fluid. For a four drop hot runner system, the accuracy has been verified by comparing the obtained results with those by a commercial simulator. This paper presents how to utilize the proposed method in the hot runner design process. Full article
(This article belongs to the Special Issue Polymer Processing for Microsystems)
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12 pages, 6988 KiB  
Article
High-Throughput Synthesis of Liposome Using an Injection-Molded Plastic Micro-Fluidic Device
by Sang-Won Woo, Yun Kyong Jo, Yeong-Eun Yoo and Sun Kyoung Kim
Micromachines 2021, 12(2), 170; https://0-doi-org.brum.beds.ac.uk/10.3390/mi12020170 - 09 Feb 2021
Cited by 4 | Viewed by 2046
Abstract
For mass production of liposomes, we designed a plastic micro-channel device on the basis of 5 μm of micro-nozzle array forming T-junction with 100 μm depth of micro-channel. A micro-channel unit for synthesizing liposomes consisted of two micro-nozzle arrays for mixing two solutions [...] Read more.
For mass production of liposomes, we designed a plastic micro-channel device on the basis of 5 μm of micro-nozzle array forming T-junction with 100 μm depth of micro-channel. A micro-channel unit for synthesizing liposomes consisted of two micro-nozzle arrays for mixing two solutions as well as delivery and recovery channels for supplying solutions and collecting liposome suspension. The number of micro-nozzles was approximately 2400 for a micro-channel unit, and seven units were applied independently on a micro-channel plate. The plastic micro-channel plate was injection-molded for mass production using a micro-channel stamper previously fabricated by UV lithography and nickel electroforming process. A plastic cover plate with seven pairs of inlet and outlet ports was machined by mechanical milling and drilling and was assembled with a micro-channel plate using a holder to form a liposome synthesizing device. Flow and mixing of solutions in the micro-channels were tested using colored water to check the micro-fluidic characteristics of the device. Finally, a L-α-phosphatidylcholine (SOY PC) liposome was synthesized using EtOH solution of SOY PC (95%) and saline (0.85% NaOH solution) to find that the liposomes were around 230 and 260 nm in diameter, depending on the flow rate of the lipid solution. Full article
(This article belongs to the Special Issue Polymer Processing for Microsystems)
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12 pages, 2969 KiB  
Article
Particle Focusing under Newtonian and Viscoelastic Flow in a Straight Rhombic Microchannel
by Joo-Yong Kwon, Taehoon Kim, Jungwoo Kim and Younghak Cho
Micromachines 2020, 11(11), 998; https://0-doi-org.brum.beds.ac.uk/10.3390/mi11110998 - 11 Nov 2020
Cited by 9 | Viewed by 2585
Abstract
Particle behavior in viscoelastic fluids has attracted considerable attention in recent years. In viscoelastic fluids, as opposed to Newtonian fluids, particle focusing can be simply realized in a microchannel without any external forces or complex structures. In this study, a polydimethylsiloxane (PDMS) microchannel [...] Read more.
Particle behavior in viscoelastic fluids has attracted considerable attention in recent years. In viscoelastic fluids, as opposed to Newtonian fluids, particle focusing can be simply realized in a microchannel without any external forces or complex structures. In this study, a polydimethylsiloxane (PDMS) microchannel with a rhombic cross-sectional shape was fabricated to experimentally investigate the behavior of inertial and elasto-inertial particles. Particle migration and behavior in Newtonian and non-Newtonian fluids were compared with respect to the flow rate and particle size to investigate their effect on the particle focusing position and focusing width. The PDMS rhombic microchannel was fabricated using basic microelectromechanical systems (MEMS) processes. The experimental results showed that single-line particle focusing was formed along the centerline of the microchannel in the non-Newtonian fluid, unlike the double-line particle focusing in the Newtonian fluid over a wide range of flow rates. Numerical simulation using the same flow conditions as in the experiments revealed that the particles suspended in the channel tend to drift toward the center of the channel owing to the negative net force throughout the cross-sectional area. This supports the experimental observation that the viscoelastic fluid in the rhombic microchannel significantly influences particle migration toward the channel center without any external force owing to coupling between the inertia and elasticity. Full article
(This article belongs to the Special Issue Polymer Processing for Microsystems)
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16 pages, 4759 KiB  
Article
Optimal Dummy Pattern Design Method for PWB Warpage Control Using the Human-Based Genetic Algorithm
by Sun Kyoung Kim and Sang-Hyuk Lee
Micromachines 2020, 11(9), 807; https://0-doi-org.brum.beds.ac.uk/10.3390/mi11090807 - 25 Aug 2020
Cited by 1 | Viewed by 2310
Abstract
In this work, a method that minimizes printed wiring board (PWB) warpage by dummy pattern design is proposed. This work suggests that dummy patterns are placed on a preset discretized location in the PWB to reduce the warpage. On each discretized candidate area, [...] Read more.
In this work, a method that minimizes printed wiring board (PWB) warpage by dummy pattern design is proposed. This work suggests that dummy patterns are placed on a preset discretized location in the PWB to reduce the warpage. On each discretized candidate area, the dummy pattern can be set or unset. The warpage is numerically simulated based on direct modeling of the as-is PWB patterns to evaluate the warpage alongside the dummy pattern design set. The optimal pattern that minimizes warpage is determined using the human-based genetic algorithm where the objective function is evaluated by the structural simulation. The optimization method is realized in a spreadsheet that allows scripting language with which the input and output files of the simulation tool can be modified and read. Two different cases have been tested and the results show that the method can determine the optimal dummy patterns. The measured and simulated deflections agree well with each other. Moreover, it has been shown that certain dummy pattern designs that should reduce the warpage can be sought by the optimization. Full article
(This article belongs to the Special Issue Polymer Processing for Microsystems)
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